EP0638771A1 - Gas cooking device with under a continuous cooking area of heat radiation transparent material, like glass-ceramics, placed radiant gas burners - Google Patents

Gas cooking device with under a continuous cooking area of heat radiation transparent material, like glass-ceramics, placed radiant gas burners Download PDF

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Publication number
EP0638771A1
EP0638771A1 EP94107892A EP94107892A EP0638771A1 EP 0638771 A1 EP0638771 A1 EP 0638771A1 EP 94107892 A EP94107892 A EP 94107892A EP 94107892 A EP94107892 A EP 94107892A EP 0638771 A1 EP0638771 A1 EP 0638771A1
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EP
European Patent Office
Prior art keywords
gas
burner
cooking device
air
burner plate
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Granted
Application number
EP94107892A
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German (de)
French (fr)
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EP0638771B1 (en
Inventor
Michael Kahlke
Kurt Dr. Schaupert
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Schott AG
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Carl Zeiss AG
Schott Glaswerke AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/04—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate
    • F24C3/06—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate without any visible flame
    • F24C3/067—Ranges

Definitions

  • the invention relates to a gas cooking device with at least one gas radiation burner arranged under a continuous cooking surface made of a material that is permeable to heat radiation, such as glass ceramic, glass, ceramic or a similar material, with a burner chamber and a burner plate, in particular made of fiber material, with control devices for the gas supply , as well as with conventional ignition, safety and temperature monitoring devices, with exhaust gas channels for discharging the combustion gases and with a device, in particular a blower, with which additional air is brought to the burner plate.
  • a gas cooking device with at least one gas radiation burner arranged under a continuous cooking surface made of a material that is permeable to heat radiation, such as glass ceramic, glass, ceramic or a similar material, with a burner chamber and a burner plate, in particular made of fiber material, with control devices for the gas supply , as well as with conventional ignition, safety and temperature monitoring devices, with exhaust gas channels for discharging the combustion gases and with a device, in particular a blower, with which additional air is brought to the burner plate.
  • Gas cooking devices with gas radiant burners and glass ceramic cooktop have been described in numerous embodiments, such. B. in US-PS 3,468,298, DE-OS 26 21 801, US-PS 4,083,355 or in US-PS 4,201,184.
  • gas radiation burners the gas is burned on the surface of a burner plate made of porous ceramic.
  • one or more such gas radiation burners are arranged at a distance below a common glass ceramic plate known per se, a cooking point being defined by each burner on the upper side of the glass ceramic plate becomes.
  • Each individual gas radiation burner is secured with an ignition device and with an ignition fuse against fuel gas flowing out unused. The description of such a burner plate is found, for. B. in EP 01 87 508 A2.
  • the temperature of the radiating burner plate is between about 900 ° C and 950 ° C depending on the temperature resistance of the material.
  • the maximum amount of gas that can be fed to the burner is limited by design measures so that a maximum operating temperature cannot be exceeded, e.g. B. to protect the material of the burner plate or the hob and also to avoid unnecessary energy losses.
  • the permissible maximum temperature of glass ceramic cooktops is usually between about 700 ° C and 750 ° C. Since in pots with unsuitable, in particular uneven floors or even when the cooking area is not occupied with a high power setting, temperatures of 900 ° C and more can occur within a short time in the glass ceramic plate, a temperature limiter is provided to protect the glass ceramic plate, by which such excess temperatures can be reliably prevented can. Such temperature limiters are e.g. B. in DE-OS 26 21 801 or US-PS 4,201,184 described in detail.
  • the burner is operated continuously and the amount of gas supplied is reduced or increased in accordance with the required output and according to the other principle the burner is operated in a clocked manner, ie the burner is always operated with the maximum amount of gas and the required output results from the ratio from switch-on time to switch-off time (clock ratio).
  • DE 33 15 745 C2 discloses a cooktop with gas-heated burners and with a continuous cooking surface made of glass ceramic or comparable material, with at least two clearly separated cooking zones, each of which is assigned a separate burning point, with a warming zone and with exhaust gas ducts for removing the combustion gases and with auxiliary devices, the burning points having combustion chambers, gas mixing chambers, gas mixing devices and regulating devices, and wherein the burning points, the warming zone and the exhaust gas channels at the areas not used for heat transfer to the hob, including all components of the burning points, from a material common to these parts, made of low-mass and heat-insulating material existing component are enclosed. From this DE 33 15 745 C2 it can also be seen that a nozzle plate can alternatively also be made from silicate fiber material (column 6, line 21/22).
  • DE 38 44 081 A1 discloses a cooking apparatus with at least one hob consisting of a burner pot inserted into a burner plate, a nozzle plate and a ceramic plate arranged at a distance above the nozzle plate, an intermediate floor being arranged below the burner pot and a space for control below the intermediate floor and / or control and / or monitoring units is formed, and wherein an exhaust gas outlet is set up, a substantially vertical shaft being arranged on the rear side of the cooking apparatus, which can be connected to an outlet duct or is designed as such, and in the room a fan is arranged for the control and / or regulating and / or monitoring units, which primarily sucks cooling air through this space from the front and presses it into the shaft, the shaft being designed as a flow channel so that the primary cooling air is above the Distance between the burners plate and the intermediate floor draws in secondary cooling air and removes the exhaust gas emerging from the space between the burner plate and the ceramic plate.
  • DE 38 44 081 A1 is based on the object of improving a cooking apparatus of the construction described with regard to the control of the waste heat and thus overall in terms of heat technology.
  • a fan is used here to remove only the exhaust gas with a relatively high level of equipment.
  • GB 2 230 595 A describes a gas cooker with a glass ceramic plate and at least one gas radiation burner arranged close under the plate, each burner having a burner chamber with a large number of individual chambers and with a burner plate pertored to match the arrangement of the chambers is made of ceramic, further with a gas supply and a fan device to provide combustion air whenever the burner is working.
  • the object of the present invention is therefore to present a gas cooking device with a new type of gas burner technology, also for different types of gas, such as natural gas or liquid gases, such as propane or butane, which has a high proportion of radiation energy at very low exhaust gas values, and is quick to respond to changes in the burner output at guarantees a large control range and guarantees maximum safety with a simple, compact design and low overall height.
  • gas such as natural gas or liquid gases, such as propane or butane
  • the object of the invention is achieved in that the device with which additional air is sucked in and brought to the burner plate, and the control device for the gas supply are in a separate room in which an overpressure is maintained, and the is connected to the burner chamber and to the outside via gas-tight lines in the area outside of the separated space on its peripheral surfaces, in particular via pipes.
  • the control device for the gas supply contains a valve block with interchangeable nozzles positioned in the block, with opening diameters from 0.5 mm to 2.0 mm, in particular with 1 mm, which can be exchanged depending on the type of gas.
  • the control can also be carried out mechanically, pneumatically or hydraulically if this is advantageous in individual cases.
  • the valve block is usually constructed in such a way that the nozzles are all arranged next to one another and emit their gas flows parallel to one another; but it can also be designed so that the gas flows flow out at an angle to one another.
  • valve block with e.g. B. 4 nozzles easily in units with z. B. 2 x 2 nozzles or 1 x 2 and 2 x 1 nozzle can be divided. This is particularly recommended if the lines carrying the gas / air mixture can remain straight in the arrangement of the modules.
  • the device with which additional air is fed to the burner plate that is to say, in particular by means of a fan, maintains an excess pressure of at least 0.1 mbar.
  • the gas-tight lines which connect the separated space to the burner chamber can have different inlet cross-sectional areas, are round, oval or rectangular and are provided with cables, coils and / or also with tapering and constrictions in the flow-through area in order to Air mixture and to support the Venturi effect.
  • the center of the inlet openings of a line, which connects the separated space to the burner chamber, is in each case arranged opposite a nozzle opening, with a variably adjustable distance.
  • the distance between the start of the pipes and the nozzle openings is adjustable in order to be individually adaptable for burners of different sizes and / or different outputs.
  • the line carrying the gas / air mixture is provided in the region of the separated space in which the excess pressure is maintained with adaptable, in particular radially arranged, openings as inlet openings for the air.
  • the line can then start directly at the valve block or in the plane of the nozzle opening.
  • the inlet openings for the air z. B. by means of a ring sleeve running on a thread of the line or by means of sliding orifices to enlarge or reduce, and are so the air requirement of the particular burner type or the respective burner size to adjust exactly and without effort.
  • the lines serve as mixing tubes over their entire length, the inflow of air into the tubes being achieved by the excess pressure and the Venturi effect arising as a result of the gas injection.
  • the gas flow is injected into the openings of the mixing tubes and entrains the necessary combustion air.
  • the inlet cross-sectional area of the line for supplying the gas / air mixture is advantageously more than 150 mm 2.
  • the valve block as part of the control device for the gas supply in the separated space is arranged so that it laterally, by means of its nozzles positioned in the valve block, the gas at an angle of less than 90 ° in openings provided in the line shoots.
  • the gas is supplied through a "side bullet" and ensures that it impacts the opposite pipe wall for turbulence and thus for a very good premixing of the gas / air mixture.
  • control device in particular the valve block, is accessible via a tightly closable service opening, in order to be able to carry out repairs without any problems or to enable the gas nozzles to be installed or removed quickly.
  • a further advantage of the invention is that the device with which additional air is brought to the burner plate is positioned in the separated space in such a way that it cools in particular the regulating device, but also other heat-sensitive control devices, by means of the air emitted by it.
  • the blower can also be positioned in the gas cooking device so that the primary cooling air drawn in by the blower must first pass through the control devices below it before it reaches the blower.
  • the fan which maintains an overpressure in the separated space, cools the exhaust gases produced during combustion by adding air by means of a bypass.
  • the exhaust gas temperatures at the outlet of the cooking device are significantly reduced by this fan arrangement. The operational safety of the cooking device and the ease of use are improved.
  • the fan can additionally cool the housing wall via an air guide system installed in the outer walls of the cooking device. This also leads to an increase in operational safety and ease of use. In some cases it can also be advantageous to divert part of the air flow generated by the fan under the burner chamber so that it hits the hot underside of the cooking zone. As a result, the top surface temperature of the glass ceramic plate can be influenced and rapid cooling of the hot areas of the plate is possible, in particular after the burner has been switched off.
  • the gas / air mixture brought through the lines to the burner plate is guided such that it is preheated by the hot exhaust gases.
  • the burner plate contains, in particular SiC fibers as the fiber material.
  • This type of burner has many advantages: If a combustible gas / air mixture with liquefied gas or natural gas flows through the porous fiber burner plate and is ignited at the top of the burner material, the material becomes raw-hot within a second due to the low thermal mass.
  • the hot burner surface emits most of the energy at infrared wavelengths; Radiation and conduction through the glass ceramic plate bring the energy to the bottom of the pot.
  • the European standard EN 30 "Household Cooking Appliances for Gaseous Fuels" specifies the requirements for the safety and usability of such systems.
  • One of the criteria is the parboiling efficiency. With the gas cooking device according to the present invention, parboiling efficiencies of 37% are achieved. These are 44% higher than the limit values specified in EN 30.
  • emissions of NO x and CO were measured on the gas cooking appliances according to the invention.
  • the emissions for NO X and CO are below the limit values of 37 ppm NO X and 54 ppm for CO (criteria for the "Blue Angel").
  • the burner plates made of SiC fibers are also environmentally friendly because the raw materials are found in large quantities in nature.
  • the composite material made from these fibers resists oxidation even at high temperatures.
  • life cycle tests over 5000 hours were carried out without any deterioration in burner properties. Even under severe combustion conditions, the burner was started 12,000 times without a change in the material being found.
  • FIGS. 2a and b different types of insulation body geometries (4) with cutouts (4a) for the burners and the exhaust pipes (4b) are to be presented in perspective view in FIG. 1b.
  • the insulation bodies are e.g. B. made of vermiculite.
  • Figure 3a shows schematically a gas cooker according to the invention in top view when the cooktop frame with the continuous glass ceramic cooking surface has been removed.
  • gas radiation burners (12) which are connected to the separated space (9) via gas-tight lines (13), here designed as smooth mixing tubes, in which the fan (14), which has an overpressure of 0, 5 mbar generated and part of the control device (15), here a 3-way valve block (15a) with magnetic control and screwed-in gas nozzles (15b) for natural gas.
  • the fan (14) which brings air from the outside to the burners (12), additionally cools the exhaust gases generated during combustion by means of a bypass (16) and further prevents increased temperatures by means of an air guide system (17) installed on the outer walls of the cooking device the housing wall.
  • the control device (15) is accessible at any time via a lockable service opening (18) in order to be able to replace the nozzles or to carry out maintenance work.
  • FIG. 3a further illustrates the guidance of the gas flows in the cooking device; it can be clearly seen that the control device (15) is cooled by the air flow from the fan (14).
  • FIG. 3b shows a modified arrangement of the 3 gas radiation burners (12), and, as in FIG. 3a, here is the center of the inlet opening of a mixing tube (13) which connects the separated, pressurized space (9) to the burner chamber (6) , arranged with variably adjustable distance.
  • the service opening is not shown here for the sake of clarity.
  • Figure 3c shows, in contrast to 3a and 3b, a control device (15), each with screwed-in gas nozzles, in which the valve block is divided into 3 individual elements.
  • the mixing tubes (13) which supply the gas radiation burners (12) with the gas / air mixture can be straight.
  • FIG. 3d shows another arrangement option for the burners (12) and the control devices (15), which are also designed as individual elements.
  • FIG. 4 shows a section through the gas cooking device according to the invention.
  • a commercially available propane / butane mixture is introduced into the mixing tube (13 ) injected with a pressure of 30 mbar.
  • the separated space (9) is under an overpressure of 0.2 mbar due to the blower, not shown here, which draws in air from the outside.
  • the air also passes through the excess pressure and the so-called Venturi effect into the mixing tube (13) and is thoroughly swirled and mixed there with the gas before the mixture then reaches the burner (12), which according to the invention consists of a burner plate (5) made of fiber material containing SiC fibers and a burner chamber (6).
  • a glass ceramic cooktop (2) as shown in FIG. B. is under the trademark CERAN of the applicant in the trade, and the arrangement to recognize once the mounting plate (7) for the burner and the control device and on the other hand the molded insulation body (4).
  • FIG. 5a illustrates a possibility of how the gas / air mixture is adjusted according to the invention, namely via displaceable diaphragms (19) which make it possible to vary the opening possibilities of the openings in the mixing tube (13), which serve as inlet openings for the air.
  • the screens (19) are arranged in the area of the oval mixing tubes (13) here, which is located in the separated space (9).
  • the mixing tubes (13) can thus start directly on the valve block (15a) of the control device (15).
  • FIG. 5b shows a further possibility of adjusting the gas / air mixture by the variably adjustable distance between the nozzle (15b) and the mixing tube (13) while
  • Figure 5c presents the possibility of adjustment via different cross-sectional threads of the mixing tubes (13).
  • Figure 6 shows a variant of the invention, according to which the gas is injected laterally.
  • the control device (15) for the gas supply is arranged in such a way that, through its nozzles (15b) positioned in the valve block (15a), it supplies the gas laterally, at an angle of approximately 40 °, into openings (20) in the mixing tube (13). , which are provided here only for the supply air, includes.
  • the gas / air mixture then reaches the burner (12) very well mixed due to the turbulence triggered on the tube wall.
  • FIG. 7a illustrates how the gas / air mixture flowing in the mixing tube (13) can be preheated by the hot exhaust gas, which is produced during the combustion, if the molded insulation body (4) is as in
  • Figure 7b is shown even more clearly, is suitably designed, and has recesses (21) in which the mixing tubes (13) and the hot exhaust air can carry out a heat exchange.
  • FIG. 8 again shows some essential features of the invention in a perspective view: the blower (14), which draws in air from the outside, and the regulating device (15) for the gas supply are located in a separate space (9) in which an overpressure is maintained is obtained.
  • Figure 9 shows the position of the reclosable service opening (18) for quickly changing the gas nozzles (15b) of the control device (15).
  • FIG. 10 shows the dependence of the volume flow on the speed, the assumed power and the static pressure of the blower used. Due to the optimal design of the system, a coordinated dimensioning of the blower parameters and the Venturi effect leads to improved control behavior of the burners. Possible pressure fluctuations in the gas supply network and resulting changes in the gas / air mixture can be absorbed with a suitable design (required by EN 30). In other words, if the gas pressure rises above the usual operating pressure, this leads, due to the then increased Venturi effect, to a lower static pressure in the separated space in relation to the usual operating pressure. As a result, the speed of the blower becomes smaller and thus the volume flow delivered increases. The gas to air ratio remains essentially constant.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Abstract

Gas cooking device with at least one radiant gas burner placed under a continuous cooking area of heat radiation transparent material, like glass-ceramics, glass, ceramics or a similar material, having a burner chamber and a burner plate (5), especially made of fibrous material, having control equipment (7b) for the gas supply, and also having conventional ignition, safety and temperature-monitoring equipment, having exhaust-gas ducts for carrying off the combustion gases, and also having a device, especially a blower or a fan, by which additional air is brought up to the burner plate (5), the device by which additional air is brought up to the burner plate (5), and the control equipment (7b) for the gas supply being situated in a separated-off space in which an overpressure is maintained, and which is connected to the burner chamber and to the outside via conduits, especially via pipes, which are gastight in the region outside the separated-off space on their peripheral surfaces.

Description

Die Erfindung bezieht sich auf eine Gaskocheinrichtung mit Wenigstens einem unter einer durchgehenden Kochfläche aus einem für Wärmestrahlung durchlässigen Material, wie Glaskeramik, Glas, Keramik bzw. einem ähnlichen Material angeordneten Gasstrahlungsbrenner mit einer Brennerkammer und einer Brennerplatte, insbesondere aus Fasermaterial, mit Regeleinrichtungen für die Gaszufuhr, sowie mit üblichen Zünd-, Sicherheits- und Temperaturüberwachungseinrichtungen, mit Abgaskanälen zum Abführen der Verbrennungsgase sowie mit einer Einrichtung, insbesondere einem Gebläse, mit dem zusätzliche Luft an die Brennerplatte herangeführt wird.The invention relates to a gas cooking device with at least one gas radiation burner arranged under a continuous cooking surface made of a material that is permeable to heat radiation, such as glass ceramic, glass, ceramic or a similar material, with a burner chamber and a burner plate, in particular made of fiber material, with control devices for the gas supply , as well as with conventional ignition, safety and temperature monitoring devices, with exhaust gas channels for discharging the combustion gases and with a device, in particular a blower, with which additional air is brought to the burner plate.

Gaskocheinrichtungen mit Gasstrahlungsbrennern und Glaskeramik-Kochplatte sind in zahlreichen Ausführungsformen beschrieben worden, so z. B. in der US-PS 3,468,298, DE-OS 26 21 801, US-PS 4,083,355 oder in der US-PS 4,201,184.
Bei Gasstrahlungsbrennern wird das Gas an der Oberfläche einer aus poröser Keramik bestehenden Brennerplatte verbrannt. Bei einer Gaskocheinrichtung sind ein oder mehrere solche Gasstrahlungsbrenner mit Abstand unter einer gemeinsamen, an sich bekannten Glaskeramikplatte angeordnet, wobei durch jeden Brenner an der Oberseite der Glaskeramikplatte eine Kochstelle definiert wird. Jeder einzelne Gasstrahlungsbrenner ist dabei mit einer Zündeinrichtung und mit einer Zündsicherung gegen unverbraucht abströmendes Brenngasgemsich gesichert. Die Beschreibung einer derartigen Brennerplatte findet sich z. B. in der EP 01 87 508 A2.Gas cooking devices with gas radiant burners and glass ceramic cooktop have been described in numerous embodiments, such. B. in US-PS 3,468,298, DE-OS 26 21 801, US-PS 4,083,355 or in US-PS 4,201,184.
In gas radiation burners, the gas is burned on the surface of a burner plate made of porous ceramic. In the case of a gas cooking device, one or more such gas radiation burners are arranged at a distance below a common glass ceramic plate known per se, a cooking point being defined by each burner on the upper side of the glass ceramic plate becomes. Each individual gas radiation burner is secured with an ignition device and with an ignition fuse against fuel gas flowing out unused. The description of such a burner plate is found, for. B. in EP 01 87 508 A2.

Die Temperatur der strahlenden Brennerplatte liegt je nach der Temperaturbeständigkeit des Materials zwischen etwa 900 °C und 950 °C. Die dem Brenner maximal zuführbare Gasmenge ist durch konstruktive Maßnahmen so begrenzt, daß eine maximale Betriebstemperatur nicht überschritten werden kann, z. B. um das Material der Brennerplatte oder der Kochfläche zu schonen und auch um überflüsssige Energieverluste zu vermeiden.The temperature of the radiating burner plate is between about 900 ° C and 950 ° C depending on the temperature resistance of the material. The maximum amount of gas that can be fed to the burner is limited by design measures so that a maximum operating temperature cannot be exceeded, e.g. B. to protect the material of the burner plate or the hob and also to avoid unnecessary energy losses.

Die zulässige Maximaltemperatur von Glaskeramikkochflächen liegt üblicherweise zwischen etwa 700 °C und 750 °C.
Da bei Töpfen mit ungeeigneten, insbesondere unebenen Böden oder auch bei nichtbesetzter Kochstelle bei eingestellter hoher Leistung innerhalb kurzer Zeit in der Glaskeramikplatte Temperaturen von 900 °C und mehr auftreten können, ist zum Schutz der Glaskeramikplatte ein Temperaturbegrenzer vorgesehen, durch den derartige Übertemperaturen sicher verhindert werden können.
Solche Temperaturbegrenzer sind z. B. in der DE-OS 26 21 801 oder der US-PS 4,201,184 ausführlich beschrieben.The permissible maximum temperature of glass ceramic cooktops is usually between about 700 ° C and 750 ° C.
Since in pots with unsuitable, in particular uneven floors or even when the cooking area is not occupied with a high power setting, temperatures of 900 ° C and more can occur within a short time in the glass ceramic plate, a temperature limiter is provided to protect the glass ceramic plate, by which such excess temperatures can be reliably prevented can.
Such temperature limiters are e.g. B. in DE-OS 26 21 801 or US-PS 4,201,184 described in detail.

Für den praktischen Einsatz zur Beheizung einer Kochfläche muß neben einer Temperaturbegrenzung auch noch eine Regelung oder Steuerung der Leistung des Brenners vorhanden sein.
Zur Steuerung der Leistung sind dabei zwei Prinzipien bekannt:
Nach dem einen wird der Brenner kontinuierlich betrieben und die zugeführte Gasmenge wird entsprechend der geforderten Leistung vermindert oder vergrößert und nach den anderen Prinzip wird der Brenner getaktet betrieben, d. h. der Brenner wird stets mit der maximalen Gasmenge betrieben und die geforderte Leistung ergibt sich aus dem Verhältnis von Einschaltzeit zu Ausschaltzeit (Taktverhältnis).For practical use for heating a cooking surface, in addition to a temperature limit, there must also be a regulation or control of the burner output.
Two principles are known for controlling the performance:
According to one, the burner is operated continuously and the amount of gas supplied is reduced or increased in accordance with the required output and according to the other principle the burner is operated in a clocked manner, ie the burner is always operated with the maximum amount of gas and the required output results from the ratio from switch-on time to switch-off time (clock ratio).

Aus der DE 33 15 745 C2 ist ein Kochfeld mit gasbeheizten Brennern und mit einer durchgehenden Kochfläche aus Glaskeramik oder vergleichbarem Material bekannt, mit mindestens zwei eindeutig getrennten Kochzonen, denen jeweils separate Brennstellen zugeordnet sind, mit einer Warmhaltezone und mit Abgaskanälen zum Abführen der Verbrennungsgase sowie mit Hilfseinrichtungen, wobei die Brennstellen Brennkammern, Gasmischkammern, Gasmischeinrichtungen und Regeleinrichtungen aufweisen und wobei die Brennstellen, die Warmhaltezone und die Abgaskanäle an den nicht der Wärmeübertragung an das Kochfeld dienenden Bereichen einschließlich aller Komponenten der Brennstellen von einem diesen Teilen gemeinsamen, aus massearmen und wärmeisolierendem Material bestehenden Bauteil umschlossen sind.
Aus dieser DE 33 15 745 C2 ist auch zu entnehmen, daß eine Düsenplatte alternativ auch aus Silikatfasermaterial hergestellt werden kann (Spalte 6, Z. 21/22).DE 33 15 745 C2 discloses a cooktop with gas-heated burners and with a continuous cooking surface made of glass ceramic or comparable material, with at least two clearly separated cooking zones, each of which is assigned a separate burning point, with a warming zone and with exhaust gas ducts for removing the combustion gases and with auxiliary devices, the burning points having combustion chambers, gas mixing chambers, gas mixing devices and regulating devices, and wherein the burning points, the warming zone and the exhaust gas channels at the areas not used for heat transfer to the hob, including all components of the burning points, from a material common to these parts, made of low-mass and heat-insulating material existing component are enclosed.
From this DE 33 15 745 C2 it can also be seen that a nozzle plate can alternatively also be made from silicate fiber material (column 6, line 21/22).

In der DE 38 44 081 A1 wird ein Kochapparat mit zumindest einem Kochfeld aus einem in eine Brennerplatte eingesetzten Brennertopf, einer Düsenplatte und einer mit Abstand über der Düsenplatte angeordneten Keramikplatte offengelegt, wobei unterhalb des Brennertopfes ein Zwischenboden angeordnet und unterhalb des Zwischenbodens ein Raum für Steuer und/oder Regel- und/oder Überwachungsaggregate ausgebildet ist, und wobei eine Abgasabführung eingerichtet ist, wobei auf der rückwärtigen Seite des Kochapparates ein im wesentlichen vertikaler Schacht angeordnet ist, der an einen Abführungskanal anschließbar oder als solcher ausgeführt ist, und wobei in dem Raum für die Steuer- und/oder Regel- und/oder Überwachungsaggregate ein Lüfter angeordnet ist, der durch diesen Raum von der Frontseite her primär Kühlluft ansaugt und diese in den Schacht eindrückt, wobei der Schacht als Strömungskanal so ausgebildet ist, das die Primärkühlluft über dem Abstandsraum zwischen der Brennerplatte und dem Zwischenboden Sekundärkühlluft ansaugt und das aus dem Raum zwischen der Brennerplatte und der Keramikplatte austretende Abgas abführt.DE 38 44 081 A1 discloses a cooking apparatus with at least one hob consisting of a burner pot inserted into a burner plate, a nozzle plate and a ceramic plate arranged at a distance above the nozzle plate, an intermediate floor being arranged below the burner pot and a space for control below the intermediate floor and / or control and / or monitoring units is formed, and wherein an exhaust gas outlet is set up, a substantially vertical shaft being arranged on the rear side of the cooking apparatus, which can be connected to an outlet duct or is designed as such, and in the room a fan is arranged for the control and / or regulating and / or monitoring units, which primarily sucks cooling air through this space from the front and presses it into the shaft, the shaft being designed as a flow channel so that the primary cooling air is above the Distance between the burners plate and the intermediate floor draws in secondary cooling air and removes the exhaust gas emerging from the space between the burner plate and the ceramic plate.

Der DE 38 44 081 A1 liegt die Aufgabe zugrunde, einen Kochapparat des beschriebenen Aufbaus in bezug auf die Beherrschung der Abwärme und damit in wärmetechnischer Hinsicht insgesamt zu verbessern.
Hier wird ein Lüfter eingesetzt, um mit relativ hohem apparativem Aufwand lediglich das Abgas zu entfernen.DE 38 44 081 A1 is based on the object of improving a cooking apparatus of the construction described with regard to the control of the waste heat and thus overall in terms of heat technology.
A fan is used here to remove only the exhaust gas with a relatively high level of equipment.

Aus der US-PS 4,020,821 ist es bekannt, ein Gebläse in eine Gaskocheinrichtung mit einer durchgehenden Platte z. B. aus Glaskeramik zu positionieren, das zusätzlich Luft für eine gute Verbrennung des Gases heranführt.
Hier werden jedoch keine Gasstrahlungsbrenner mit Brennerplatten, sondern Brenner mit offener Flamme eingesetzt.From US-PS 4,020,821 it is known to use a fan in a gas cooking device with a continuous plate. B. from glass ceramic to position, which also introduces air for a good combustion of the gas.
Here, however, no gas radiation burners with burner plates are used, but burners with an open flame.

In der GB 2 230 595 A ist ein Gasherd beschrieben, mit einer Glaskeramik-Platte und mindestens einem dicht unter der Platte angeordnetem Gasstrahlungsbrenner, wobei jeder Brenner eine Brennerkammer mit einer großen Anzahl von Einzelkammern aufweist und wobei darüber eine passend zur Anordnung der Kammern pertorierte Brennerplatte aus Keramik angeordnet ist, des weiteren mit einer Gaszuführung und einer Ventilatoreinrichtung um Verbrennungsluft immer dann zur Verfügung stellen, wenn der Brenner arbeitet.GB 2 230 595 A describes a gas cooker with a glass ceramic plate and at least one gas radiation burner arranged close under the plate, each burner having a burner chamber with a large number of individual chambers and with a burner plate pertored to match the arrangement of the chambers is made of ceramic, further with a gas supply and a fan device to provide combustion air whenever the burner is working.

Sowohl die US-PS 4,020,821 wie auch die GB 2 230 595 A zeigen die Verwendung von Ventilatoren bzw. Gebläsen bei Gaskocheinrichtungen mit durchgehenden Glaskeramik-Kochflächen, jedoch ist die Gesamtanordnung der Kocheinrichtungen sehr kompliziert und aufwendig und daher dementsprechend anfällig im praktischen Einsatz und teuer in der Herstellung.Both US Pat. No. 4,020,821 and GB 2 230 595 A show the use of fans or blowers in gas cooking devices with continuous glass ceramic cooktops, but the overall arrangement of the cooking devices is very complicated and complex and therefore accordingly susceptible to practical use and expensive the production.

Aufgabe der vorliegenden Erfindung ist es daher, eine Gaskocheinrichtung mit neuartiger Gasbrennertechnik, auch für verschiedene Gassorten, wie Erdgas oder Flüssiggase, wie Propan oder Butan vorzustellen, die bei sehr niedrigen Abgaswerten einen hohen Anteil an Strahlungsenergie aufweist, schnelles Ansprechen auf Änderungen der Brennerleistung bei einem großen Regelbereich gewährleistet und bei einfachem kompakten Aufbau und niedriger Bauhöhe höchstmögliche Sicherheit garantiert.The object of the present invention is therefore to present a gas cooking device with a new type of gas burner technology, also for different types of gas, such as natural gas or liquid gases, such as propane or butane, which has a high proportion of radiation energy at very low exhaust gas values, and is quick to respond to changes in the burner output at guarantees a large control range and guarantees maximum safety with a simple, compact design and low overall height.

Weiter ist es Aufgabe der Erfindung eine Kocheinrichtung anzubieten, die die Vorteile der Gasflamme mit der Reinigungsfreundlichkeit und dem ansprechenden Aussehen einer Glaskeramik-Kochfläche in idealer Weise verbindet und darüber hinaus preisgünstig in der Herstellung ist; insbesondere auch mit einem Minimum an teuren und schwer zu entsorgenden Wärmedämmung materialien auskommt, und einen minimalen Aufwand bei Wartung und Reparatur erfordert, auch weil alle Baugruppen übersichtlich angeordnet und leicht zugänglich sind.It is a further object of the invention to offer a cooking device which combines the advantages of the gas flame with the ease of cleaning and the attractive appearance of a glass ceramic cooking surface in an ideal manner and, moreover, is inexpensive to manufacture; especially with a minimum of expensive and difficult to dispose of thermal insulation materials and requires minimal maintenance and repair work, also because all components are clearly arranged and easily accessible.

Die Aufgabe nach der Erfindung wird dadurch gelöst, daß sich die Einrichtung, mit der von außen zusätzlich Luft angesaugt und an die Brennerplatte herangeführt wird, und die Regeleinrichtung für die Gaszufuhr in einem abgetrennten Raum befinden, in dem ein Überdruck aufrecht erhalten wird, und der über, im Bereich außerhalb des abgetrennten Raumes auf ihren Umfangsflächen gasdichte Leitungen, insbesondere über Rohre mit der Brennerkammer und nach außen in Verbindung steht.The object of the invention is achieved in that the device with which additional air is sucked in and brought to the burner plate, and the control device for the gas supply are in a separate room in which an overpressure is maintained, and the is connected to the burner chamber and to the outside via gas-tight lines in the area outside of the separated space on its peripheral surfaces, in particular via pipes.

Die Regeleinrichtung für die Gaszufuhr enthält einen Ventilblock mit im Block positionierten auswechselbaren Düsen, mit Öffnungsdurchmessern von 0.5 mm bis 2.0 mm, insbesondere mit 1 mm, die je nach Gasart ausgetauscht werden können.The control device for the gas supply contains a valve block with interchangeable nozzles positioned in the block, with opening diameters from 0.5 mm to 2.0 mm, in particular with 1 mm, which can be exchanged depending on the type of gas.

Die Steuerung kann dabei auch mechanisch, pneumatisch oder hydraulisch erfolgen, wenn das im Einzelfall vorteilhaft ist. Der Ventilblock ist üblicherweise so aufgebaut, daß die Düsen alle nebeneinander angeordnet sind und ihre Gasströme parallel zueinander abgeben; er kann aber auch so ausgebildet sein, daß die Gasströme im Winkel zueinander abströmen.The control can also be carried out mechanically, pneumatically or hydraulically if this is advantageous in individual cases. The valve block is usually constructed in such a way that the nozzles are all arranged next to one another and emit their gas flows parallel to one another; but it can also be designed so that the gas flows flow out at an angle to one another.

Sollte es aus räumlichen Gründen notwendig sein, kann ein Ventilblock mit z. B. 4 Düsen problemlos auch in Einheiten mit z. B. 2 x 2 Düsen oder 1 x 2 und 2 x 1 Düse aufgeteilt werden.
Dies ist besonders dann empfohlen, wenn dadurch die das Gas/Luftgemisch führenden Leitungen in der Anordnung der Baugruppen gerade bleiben können.Should it be necessary for spatial reasons, a valve block with e.g. B. 4 nozzles easily in units with z. B. 2 x 2 nozzles or 1 x 2 and 2 x 1 nozzle can be divided.
This is particularly recommended if the lines carrying the gas / air mixture can remain straight in the arrangement of the modules.

In dem abgetrennten Raum wird durch die Einrichtung mit der zusätzlich Luft an die Brennerplatte herangeführt wird, also insbesondere durch ein Gebläse ein Überdruck von mindestens 0.1 mbar aufrecht erhalten.
Die gasdichten Leitungen, die den abgetrennten Raum mit der Brennerkammer verbinden, können verschiedene Eintrittsquerschnitt-Flächen aufweisen, sind rund, oval oder rechteckig ausgebildet und mit Zügen, Wendeln und/oder auch mit Verjüngungen und Einschnürungen im durchströmten Bereich versehen, um die Gas-/Luftmischung und den Venturi-Effekt zu unterstützen.In the separated space, the device with which additional air is fed to the burner plate, that is to say, in particular by means of a fan, maintains an excess pressure of at least 0.1 mbar.
The gas-tight lines which connect the separated space to the burner chamber can have different inlet cross-sectional areas, are round, oval or rectangular and are provided with cables, coils and / or also with tapering and constrictions in the flow-through area in order to Air mixture and to support the Venturi effect.

Die Mitte der Eintrittsöffnungen einer Leitung, die den abgetrennten Raum mit der Brennerkammer verbindet, ist dabei jeweils gegenüber einer Düsenöffnung, mit variabel dazu einstellbaren Abstand angeordnet.
Der Abstand zwischen dem Beginn der Rohre und den Düsenöffnungen ist einstellbar um auch für Brenner unterschiedlicher Größe und/oder unterschiedlicher Leistung individuell anpaßbar zu sein.The center of the inlet openings of a line, which connects the separated space to the burner chamber, is in each case arranged opposite a nozzle opening, with a variably adjustable distance.
The distance between the start of the pipes and the nozzle openings is adjustable in order to be individually adaptable for burners of different sizes and / or different outputs.

In besonders bevorzugter Ausführungsform ist die das Gas-/Luftgemisch führende Leitung im Bereich des abgetrennten Raumes, in dem der Überdurck aufrecht erhalten wird mit anpaßbaren, insbesondere radial angeordneten Durchbrechungen als Eintrittsöffnungen für die Luft versehen.
Die Leitung kann dann unmittelbar am Ventilblock oder in der Ebene der Düsenöffnung beginnen.
Dadurch sind definierte Montageverhältnisse und eine konstante Luftmengenzufuhr gewährleistet.
Vorteilhafterweise sind die Eintrittsöffnungen für die Luft z. B. mittels einer auf einem Gewinde der Leitung laufenden Ringmanschette oder mittels verschiebbaren Blenden zu vergrößern oder zu verkleinern, und sind so dem Luftbedarf des jeweiligen Brennertyps oder der jeweiligen Brennergröße genau und ohne Aufwand anzupassen.
Die Leitungen dienen bei diesen Ausführungsformen über ihre gesamte Länge als Mischrohre, wobei die Lufteinströmung in die Rohre durch den Überdruck und den in Folge der Gaseindüsung entstehenden Venturi-Effekt erreicht wird.In a particularly preferred embodiment, the line carrying the gas / air mixture is provided in the region of the separated space in which the excess pressure is maintained with adaptable, in particular radially arranged, openings as inlet openings for the air.
The line can then start directly at the valve block or in the plane of the nozzle opening.
This ensures defined installation conditions and a constant supply of air.
Advantageously, the inlet openings for the air z. B. by means of a ring sleeve running on a thread of the line or by means of sliding orifices to enlarge or reduce, and are so the air requirement of the particular burner type or the respective burner size to adjust exactly and without effort.
In these embodiments, the lines serve as mixing tubes over their entire length, the inflow of air into the tubes being achieved by the excess pressure and the Venturi effect arising as a result of the gas injection.

Der Gasstrom wird in die Öffnungen der Mischrohre eingeschossen und reißt die notwendige Verbrennungsluft mit.
Vorteilhafterweise beträgt die Eintritts-Querschnittsfläche der Leitung für die Zufuhr des Gas/Luftgemisches mehr als 150 mm².The gas flow is injected into the openings of the mixing tubes and entrains the necessary combustion air.
The inlet cross-sectional area of the line for supplying the gas / air mixture is advantageously more than 150 mm 2.

Gemäß einer anderen erfindungsgemäßen Ausführungsform ist der Ventilblock als Teil der Regeleinrichtung für die Gaszufuhr in dem abgetrennten Raum so angeordnet, daß er mittels seiner im Ventilblock positionierten Düsen das Gas seitlich, in einem Winkel von kleiner 90° in Öffnungen, die in der Leitung vorgesehen sind, einschießt.
Hierbei wird das Gas durch einen "Seiteneinschuß" zugeführt und sorgt dadurch, daß es an die gegenüberliegende Rohrwandung prallt für Turbulenzen und so für eine sehr gute Vormischung des Gas-/Luftgemisches.According to another embodiment of the invention, the valve block as part of the control device for the gas supply in the separated space is arranged so that it laterally, by means of its nozzles positioned in the valve block, the gas at an angle of less than 90 ° in openings provided in the line shoots.
Here, the gas is supplied through a "side bullet" and ensures that it impacts the opposite pipe wall for turbulence and thus for a very good premixing of the gas / air mixture.

Dabei ist in einer sehr bevorzugten Ausführungsform die Regeleinrichtung, insbesondere der Ventilblock, über eine dicht verschließbare Serviceöffnung zugänglich, um problemlos Reparaturen ausführen zu können oder um eine schnelle Montage oder Demontage der Gasdüsen zu ermöglichen.In a very preferred embodiment, the control device, in particular the valve block, is accessible via a tightly closable service opening, in order to be able to carry out repairs without any problems or to enable the gas nozzles to be installed or removed quickly.

Ein weiterer Vorteil der Erfindung ist, daß die Einrichtung mit der zusätzlich Luft an die Brennerplatte herangeführt wird, so im abgetrennten Raum positioniert ist, daß sie insbesondere die Regeleinrichtung, aber auch andere wärmeempfindliche Steuereinrichtungen, durch die von ihr abgegebene Luft kühlt.
Dabei kann das Gebläse zusätzlich so in der Gaskocheinrichtung positioniert werden, daß die vom Gebläse angesaugte Primärkühlluft zuerst auch darunterliegende Steuer- und Regeleinrichtungen passieren muß, ehe sie in das Gebläse gelangt.A further advantage of the invention is that the device with which additional air is brought to the burner plate is positioned in the separated space in such a way that it cools in particular the regulating device, but also other heat-sensitive control devices, by means of the air emitted by it.
The blower can also be positioned in the gas cooking device so that the primary cooling air drawn in by the blower must first pass through the control devices below it before it reaches the blower.

In einer weiteren vorteilhaften Ausführungsform kühlt das Gebläse, das einen Überdruck im abgetrennten Raum aufrecht erhält, über einen Bypass die bei der Verbrennung entstehenden Abgase durch Zumischung von Luft.
Die Abgastemperaturen am Austritt des Kochgerätes werden durch diese Gebläseanordnung deutlich reduziert. Die Betriebssicherheit des Kochgerätes und der Bedienungskomfort wird dabei verbessert.In a further advantageous embodiment, the fan, which maintains an overpressure in the separated space, cools the exhaust gases produced during combustion by adding air by means of a bypass.
The exhaust gas temperatures at the outlet of the cooking device are significantly reduced by this fan arrangement. The operational safety of the cooking device and the ease of use are improved.

Nach der Erfindung kann das Gebläse zusätzlich über ein in den Außenwänden der Kocheinrichtung installiertes Luftleitsystem die Gehäusewandung kühlen. Dies führt ebenso wieder zu einer Erhöhung der Betriebssicherheit und des Bedienkomforts.
In machen Fällen kann es auch vorteilhaft sein, einen Teil des vom Gebläse erzeugten Luftstromes so unter der Brennerkammer umzuleiten, daß er auf die heiße Kochzonenunterseite trifft. Dadurch ist die Oberseitentemperatur der Glaskeramikplatte zu beeinflussen, und ein rasches Abkühlen der Heißbereiche der Platte, insbesondere nach Abschalten der Brenner möglich.According to the invention, the fan can additionally cool the housing wall via an air guide system installed in the outer walls of the cooking device. This also leads to an increase in operational safety and ease of use.
In some cases it can also be advantageous to divert part of the air flow generated by the fan under the burner chamber so that it hits the hot underside of the cooking zone. As a result, the top surface temperature of the glass ceramic plate can be influenced and rapid cooling of the hot areas of the plate is possible, in particular after the burner has been switched off.

Nach der Erfindung ist es auch möglich, daß das durch die Leitungen an die Brennerplatte herangebrachte Gas-/Luftgemisch so geführt wird, daß es durch die heißen Abgase vorgewärmt wird.
Diese Maßnahmen führen besonders zu verbesserten Wirkungsgraden und damit auch zu einer Energieeinsparung.According to the invention, it is also possible that the gas / air mixture brought through the lines to the burner plate is guided such that it is preheated by the hot exhaust gases.
These measures lead in particular to improved efficiencies and thus also to energy savings.

In ganz bevorzugter Ausführungsform nach der Erfindung enthält die Brennerplatte, insbesondere SiC-Fasern als Fasermaterial.In a very preferred embodiment according to the invention, the burner plate contains, in particular SiC fibers as the fiber material.

Dieser Brennertypus hat viele Vorteile:
Durchströmt ein brennbares Gas-/Luftgemisch mit Flüssiggas oder mit Erdgas die poröse Faser-Brennerplatte und wird an der Oberseite des Brennermaterials gezündet, dann wird aufgrund der geringen thermischen Masse das Material innerhalb einer Sekunde rohglühend.
Die heiße Brenneroberfläche strahlt den Hauptteil der Energie bei Infraroten Wellenlängen ab; durch Strahlung und Leitung durch die Glaskeramik-Platte gelangt die Energie an den Topfboden.This type of burner has many advantages:
If a combustible gas / air mixture with liquefied gas or natural gas flows through the porous fiber burner plate and is ignited at the top of the burner material, the material becomes raw-hot within a second due to the low thermal mass.
The hot burner surface emits most of the energy at infrared wavelengths; Radiation and conduction through the glass ceramic plate bring the energy to the bottom of the pot.

In der Europäischen Norm EN 30 "Haushaltskochgeräte für gasförmige Brennstoffe" sind die Anforderungen an die Sicherheit und Gebrauchstauglichkeit solcher Systeme festgelegt. Eines der Kriterien ist der Ankochwirkungsgrad. Mit dem Gaskochgerät nach der vorliegenden Erfindung werden Ankochwirkungsgrade von 37 % erreicht. Diese liegen um 44 % höher als die in der EN 30 festgelegten Grenzwerte.The European standard EN 30 "Household Cooking Appliances for Gaseous Fuels" specifies the requirements for the safety and usability of such systems. One of the criteria is the parboiling efficiency. With the gas cooking device according to the present invention, parboiling efficiencies of 37% are achieved. These are 44% higher than the limit values specified in EN 30.

Des weiteren wurden an den erfindungsgemäßen Gaskochgeräten Emissionen von NOX und CO gemessen. Die Emissionen für NOX und CO liegen unter den Grenzwerten von 37 ppm NOX bzw. 54 ppm für CO (Kriterien für den "Blauen Engel").Furthermore, emissions of NO x and CO were measured on the gas cooking appliances according to the invention. The emissions for NO X and CO are below the limit values of 37 ppm NO X and 54 ppm for CO (criteria for the "Blue Angel").

Die Brennerplatten aus SiC-Fasern sind darüber hinaus auch noch umweltfreundlich, da die Rohstoffe in der Natur in großen Mengen vorkommen. Der aus diesen Fasern gebildete Verbundwerkstoff widersteht der Oxidation auch noch bei hohen Temperaturen. Mit dem Faserbrenner nach der Erfindung wurden Lebenensdauer-Zyklustests über 5000 Stunden ohne jede Verschlechterung der Brennereigenschaften durchgeführt. Auch unter verschärften Verbrennungsbedingungen wurde der Brenner 12000 mal gestartet, ohne daß eine Veränderung des Materials festgestellt werden konnte.The burner plates made of SiC fibers are also environmentally friendly because the raw materials are found in large quantities in nature. The composite material made from these fibers resists oxidation even at high temperatures. With the fiber burner of the invention, life cycle tests over 5000 hours were carried out without any deterioration in burner properties. Even under severe combustion conditions, the burner was started 12,000 times without a change in the material being found.

Darüber hinaus ist bis heute keine Gefährdung von Menschen durch Siliziumkarbid-Fasern bekannt geworden.In addition, no danger to humans from silicon carbide fibers has been reported to date.

Die Erfindung soll nun noch anhand der Figuren 1 bis 10 und den dazu gehörenden Ausführungsbeispielen näher verdeutlicht werden. Dabei zeigen:
In den Figuren 1 a-f ist eine Gaskocheinrichtung nach der Erfindung mit ihren wesentlichen Baugruppen in einer perspektivischen Explosionsdarstellung skizziert dargestellt:

Figur 1a
zeigt einen Kochfeldrahmen (1) mit eingebauter Glaskeramik-Kochfläche (2) und einem Abgasaustritt (3),
Figur 1b
einen Isolationsformkörper (4), mit Aussparungen für die Brenner (4a) und die Abgasführung (4b),
Figur 1c
Brennerplatten (5) aus Fasermaterial, die in den Brennerkammern gasdicht eingeklebt sind,
Figur 1d
ein Montageblech (7) für die Brenner (7a) und die Regeleinrichtung (7b) und eine Aussparung (7c) für den Bypass-Schlitz
Figur 1e
ein Doppelwandgehäuse (8) mit dem abgetrennten Raum (9) und ein Luftleitungssystem (10) zur Gehäusekühlung und
Figur 1f
das Bodenblech (11) mit Aussparungen (11a) für die Gebläseansaugung und die Serviceöffnung (11b).
The invention will now be explained in more detail with reference to FIGS. 1 to 10 and the associated exemplary embodiments. Show:
In Figures 1 af, a gas cooking device according to the invention with its essential assemblies is shown in a perspective exploded view:
Figure 1a
shows a hob frame (1) with built-in glass ceramic hob (2) and an exhaust gas outlet (3),
Figure 1b
a molded insulation body (4) with cutouts for the burners (4a) and the exhaust gas duct (4b),
Figure 1c
Burner plates (5) made of fiber material, which are glued gas-tight in the burner chambers,
Figure 1d
a mounting plate (7) for the burners (7a) and the control device (7b) and a recess (7c) for the bypass slot
Figure 1e
a double wall housing (8) with the separated space (9) and an air duct system (10) for cooling the housing and
Figure 1f
the bottom plate (11) with recesses (11a) for the fan suction and the service opening (11b).

In den Figuren 2a und b sollen von Figur 1 b verschiedene Typen von Isolationskörpergeometrien (4) mit Aussparungen (4a) für die Brenner und die Abgasleitungen (4b) in perspektivischer Darstellung vorgestellt werden. Die Isolationskörper sind z. B. aus Vermiculit hergestellt.In FIGS. 2a and b, different types of insulation body geometries (4) with cutouts (4a) for the burners and the exhaust pipes (4b) are to be presented in perspective view in FIG. 1b. The insulation bodies are e.g. B. made of vermiculite.

Figur 3a zeigt schematisch ein Gaskochgerät nach der Erfindung in der Aufsicht, wenn der Kochfeldrahmen mit der durchgehenden Glaskeramik-Kochfläche abgenommen ist.Figure 3a shows schematically a gas cooker according to the invention in top view when the cooktop frame with the continuous glass ceramic cooking surface has been removed.

Es sind 3 Gasstrahlungsbrenner (12) zu erkennen, die über gasdichte Leitungen (13), hier als glatte Mischrohre ausgebildet, mit dem abgetrennten Raum (9) in Verbindung stehen, in dem sich das Gebläse (14), das einen Überdruck von 0,5 mbar erzeugt und ein Teil der Regeleinrichtung (15), hier ein 3er-Ventilblock (15a) mit Magnetsteuerung und eingeschraubten Gasdüsen (15b) für Erdgas, befinden.There are 3 gas radiation burners (12) which are connected to the separated space (9) via gas-tight lines (13), here designed as smooth mixing tubes, in which the fan (14), which has an overpressure of 0, 5 mbar generated and part of the control device (15), here a 3-way valve block (15a) with magnetic control and screwed-in gas nozzles (15b) for natural gas.

Das Gebläse (14), das von außen Luft an die Brenner (12) heranführt, kühlt zusätzlich über einen Bypass (16) die bei der Verbrennung entstehenden Abgase und verhindert weiterhin durch ein an den Außenwänden der Kocheinrichtung installiertes Luftleitsystem (17) erhöhte Temperaturen an der Gehäusewandung.
Über eine verschließbare Service-Öffnung (18) ist die Regeleinrichtung (15) jederzeit zugänglich, um die Düsen austauschen oder Wartungsarbeiten vornehmen zu können.The fan (14), which brings air from the outside to the burners (12), additionally cools the exhaust gases generated during combustion by means of a bypass (16) and further prevents increased temperatures by means of an air guide system (17) installed on the outer walls of the cooking device the housing wall.
The control device (15) is accessible at any time via a lockable service opening (18) in order to be able to replace the nozzles or to carry out maintenance work.

Figur 3a veranschaulicht weiterhin die Führung der Gasstöme im Kochgerät; es ist gut zu erkennen, daß die Regeleinrichtung (15) durch den Luftstrom des Gebläses (14) gekühlt wird.FIG. 3a further illustrates the guidance of the gas flows in the cooking device; it can be clearly seen that the control device (15) is cooled by the air flow from the fan (14).

In Figur 3b ist eine modifizierte Anordnung der 3 Gasstrahlungsbrenner (12) gezeigt, und wie in Figur 3a ist hier die Mitte der Eintrittsöffnung eines Mischrohres (13), das den abgetrennten, unter Überdruck stehenden Raum (9) mit der Brennerkammer (6) verbindet, mit variabel dazu einstellbarem Abstand angeordnet. Die Service-Öffnung ist hier der besseren Übersicht halber nicht dargestellt.FIG. 3b shows a modified arrangement of the 3 gas radiation burners (12), and, as in FIG. 3a, here is the center of the inlet opening of a mixing tube (13) which connects the separated, pressurized space (9) to the burner chamber (6) , arranged with variably adjustable distance. The service opening is not shown here for the sake of clarity.

Figur 3c zeigt im Unterschied zu 3a und 3b eine Regeleinrichtung (15) mit jeweils eingeschraubten Gasdüsen, bei der der Ventilblock in 3 Einzelelemente aufgeteilt ist. Dadurch können die Mischrohre (13) die die Gasstrahlungsbrenner (12) mit dem Gas-/Luftgemisch versorgen, gerade ausgebildet sein.Figure 3c shows, in contrast to 3a and 3b, a control device (15), each with screwed-in gas nozzles, in which the valve block is divided into 3 individual elements. As a result, the mixing tubes (13) which supply the gas radiation burners (12) with the gas / air mixture can be straight.

Figur 3d zeigt im Vergleich zu den Figuren 3a - 3c eine andere Anordnungsmöglichkeit der Brenner (12) und der auch hier als Einzelelemente ausgebildeten Regeleinrichtungen (15).In comparison to FIGS. 3a-3c, FIG. 3d shows another arrangement option for the burners (12) and the control devices (15), which are also designed as individual elements.

Figur 4 stellt einen Schnitt durch die erfindungsgemäße Gaskocheinrichtung dar. Über die Gasdüse (15b) mit einem Öffnungsdurchmesser von 1.0 mm der magnetisch gesteuerten Regeleinrichtung (15) mit dem Ventilblock (15a) wird als Gas ein handelsübliches Propan-/Butangemisch in das Mischrohr (13) mit einem Druck von 30 mbar eingeschossen. Der abgetrennte Raum (9) steht durch das hier nicht dargestellte Gebläse, das Luft von außen ansaugt, unter einem Überdruck von 0,2 mbar. Die Luft gelangt durch den Überdruck und den sog. Venturi-Effekt ebenfalls in das Mischrohr (13) und wird dort gründlich mit dem Gas verwirbelt und vermischt, bevor das Gemisch dann in den Brenner (12) gelangt, der nach der Erfindung aus einer Brennerplatte (5) aus Fasermaterial, das SiC-Fasern enthält und einer Brennerkammer (6) aufgebaut ist.FIG. 4 shows a section through the gas cooking device according to the invention. Via the gas nozzle (15b) with an opening diameter of 1.0 mm of the magnetically controlled control device (15) with the valve block (15a), a commercially available propane / butane mixture is introduced into the mixing tube (13 ) injected with a pressure of 30 mbar. The separated space (9) is under an overpressure of 0.2 mbar due to the blower, not shown here, which draws in air from the outside. The air also passes through the excess pressure and the so-called Venturi effect into the mixing tube (13) and is thoroughly swirled and mixed there with the gas before the mixture then reaches the burner (12), which according to the invention consists of a burner plate (5) made of fiber material containing SiC fibers and a burner chamber (6).

Weiter ist in der Figur 4 eine Glaskeramik-Kochfläche (2) wie sie z. B. unter dem Warenzeichen CERAN der Anmelderin im Handel ist, und die Anordnung, einmal des Montagebleches (7) für die Brenner und die Regeleinrichtung und zum anderen der Isolationsformkörper (4) zu erkennen.Furthermore, a glass ceramic cooktop (2) as shown in FIG. B. is under the trademark CERAN of the applicant in the trade, and the arrangement to recognize once the mounting plate (7) for the burner and the control device and on the other hand the molded insulation body (4).

Figur 5a veranschaulicht eine Möglichkeit, wie nach der Erfindung die Einstellung des Gas-/Luftgemisches vorgenommen wird, nämlich über verschiebbare Blenden (19), die die Öffnungsmöglichkeiten der Durchbrechungen im Mischrohr (13) variierbar machen, die als Eintrittsöffnungen für die Luft dienen. Die Blenden (19) sind in dem Bereich der hier ovalen Mischrohre (13) angeordnet, der sich im abgetrennten Raum (9) befindet.FIG. 5a illustrates a possibility of how the gas / air mixture is adjusted according to the invention, namely via displaceable diaphragms (19) which make it possible to vary the opening possibilities of the openings in the mixing tube (13), which serve as inlet openings for the air. The screens (19) are arranged in the area of the oval mixing tubes (13) here, which is located in the separated space (9).

Die Mischrohre (13) können dadurch direkt am Ventilblock (15a) der Regeleinrichtung (15) beginnen.The mixing tubes (13) can thus start directly on the valve block (15a) of the control device (15).

Figur 5b zeigt eine weitere Möglichkeit das Gas-/Luftgemisch durch den variabel einstellbaren Abstand zwischen Düse (15b) und Mischrohr (13) einzustellen, währendFIG. 5b shows a further possibility of adjusting the gas / air mixture by the variably adjustable distance between the nozzle (15b) and the mixing tube (13) while

Figur 5c die Möglichkeit der Einstellung über verschiedene Querschnittsfäden der Mischrohre (13) vorstellt.Figure 5c presents the possibility of adjustment via different cross-sectional threads of the mixing tubes (13).

Figur 6 zeigt eine Variante der Erfindung, wonach der Gaseinschuß seitlich erfolgt.
Dabei ist die Regeleinrichtung (15) für die Gaszufuhr so angeordnet, daß sie durch ihre im Ventilblock (15a) positionierten Düsen (15b) das Gas seitlich, in einem Winkel von etwa 40° in Öffnungen (20), die im Mischrohr (13), das hier zuerst nur die Zuluft heranführt vorgesehen sind, einschließt.Figure 6 shows a variant of the invention, according to which the gas is injected laterally.
The control device (15) for the gas supply is arranged in such a way that, through its nozzles (15b) positioned in the valve block (15a), it supplies the gas laterally, at an angle of approximately 40 °, into openings (20) in the mixing tube (13). , which are provided here only for the supply air, includes.

Das Gas-/Luftgemisch gelangt dann durch die an der Rohrwandung ausgelösten Turbulenzen sehr gut vermischt in den Brenner (12).The gas / air mixture then reaches the burner (12) very well mixed due to the turbulence triggered on the tube wall.

Figur 7a veranschaulicht, wie das im Mischrohr (13) anströmende Gas-/Luftgemisch durch das heiße Abgas, das bei der Verbrennung entsteht, vorgewärmt werden kann, wenn der Isolationsformkörper (4) wie inFIG. 7a illustrates how the gas / air mixture flowing in the mixing tube (13) can be preheated by the hot exhaust gas, which is produced during the combustion, if the molded insulation body (4) is as in

Figur 7b noch deutlicher gezeigt, geeignet gestaltet ist, und Aussparungen (21) aufweist bei denen die Mischrohre (13) und die heiße Abluft einen Wärmeaustausch vornehmen können.Figure 7b is shown even more clearly, is suitably designed, and has recesses (21) in which the mixing tubes (13) and the hot exhaust air can carry out a heat exchange.

In Figur 8 sind nochmals, in perspektivischer Sicht einige wesentliche Merkmale der Erfindung dargestellt: Das Gebläse (14), das von außen Luft ansaugt und die Regeleinrichtung (15) für die Gaszufuhr befinden sich in einem abgetrennten Raum (9) in dem ein Überdruck aufrecht erhalten wird.FIG. 8 again shows some essential features of the invention in a perspective view: the blower (14), which draws in air from the outside, and the regulating device (15) for the gas supply are located in a separate space (9) in which an overpressure is maintained is obtained.

Figur 9 zeigt die Lage der wiederverschließbaren Service-Öffnung (18) zum schnellen Auswechseln der Gasdüsen (15b) der Regeleinrichtung (15).Figure 9 shows the position of the reclosable service opening (18) for quickly changing the gas nozzles (15b) of the control device (15).

In Figur 10 ist die Abhängigkeit des Volumenstroms von der Drehzahl, der angenommenen Leistung und des statischen Drucks des verwendeten Gebläses dargestellt.
Durch die optimale Auslegung des Systems führt eine aufeinander abgestimmte Dimensionierung von Gebläseparametern und Venturi-Effekt zu einem verbesserten Regelverhalten der Brenner. Mögliche Druckschwankungen im Gasversorgungsnetz und daraus resultierende Änderungen im Gas-/Luftgemisch können bei geeigneter Auslegung abgefangen werden (wird von EN 30 gefordert).
D. h., steigt der Gasdruck über den üblichen Betriebsdruck an, so führt dies, bedingt durch den dann verstärkten Venturi-Effekt, zu einem im Verhältnis zum üblichen Betriebsdruck niedrigeren statischen Druck im abgetrennten Raum. Demzufolge wir die Drehzahl des Gebläses kleiner und damit der geförderte Volumenstrom größer. Das Verhältnis Gas zu Luft bleibt im wesentlichen konstant.
Fällt der Gasdruck unter den üblichen Betriebsdruck, führt dies zu einem schwächeren Venturi-Effekt und somit im Verhältnis zum üblichen Betriebsdruck größeren statischen Druck im abgetrennten Raum. Die Drehzahl des Gebläses wird größer und damit der geförderte Volumenstrom kleiner. Das Gas-/Luftgemisch bleibt innerhalb tolerabler Grenzen.
In beiden Fällen bleibt die Verbrennungsgüte (CO, NOX) im günstigen Bereich.FIG. 10 shows the dependence of the volume flow on the speed, the assumed power and the static pressure of the blower used.
Due to the optimal design of the system, a coordinated dimensioning of the blower parameters and the Venturi effect leads to improved control behavior of the burners. Possible pressure fluctuations in the gas supply network and resulting changes in the gas / air mixture can be absorbed with a suitable design (required by EN 30).
In other words, if the gas pressure rises above the usual operating pressure, this leads, due to the then increased Venturi effect, to a lower static pressure in the separated space in relation to the usual operating pressure. As a result, the speed of the blower becomes smaller and thus the volume flow delivered increases. The gas to air ratio remains essentially constant.
If the gas pressure falls below the usual operating pressure, this leads to a weaker Venturi effect and thus, in relation to the usual operating pressure, a higher static pressure in the separated room. The speed of the fan increases and the volume flow delivered is smaller. The gas / air mixture remains within tolerable limits.
In both cases, the combustion quality (CO, NO X ) remains in the favorable range.

Die Vorteile der vorliegenden Erfindung sind:

  • hoher Anteil an Strahlungsenergie
  • niedrige Abgaswerte
  • schnelles und visuell erkennbares Ansprechen auf Änderungen der Brennerleistung
  • großer Regelbereich
  • trotz der hohen Oberflächentemperatur (> 800 °C) der Faser-Brennerplatte bleibt die Brennerkammer und der Brennerkammerrand relativ kühl (etwa 50 °C)
  • gleichmäßiges helles Glühbild durch den hohen Emissionsgrad (95 %) von SiC
  • einfacher, kompakter und kostengünstiger Aufbau mit niedrigen Bauhöhen (etwa 80 mm)
  • übersichtliche Anordnung aller Baugruppen
  • wartungs- und reparaturfreundlich
  • ein Gebläse/Lüfter
       für die Zwangsbelüftung aller Brenner
       für die verschiedenen Kühlaufgaben
  • Regeleinrichtung der Brenner ist jederzeit leicht zugänglich
  • austauschbare Gasdüsen für verschiedene Gasarten
  • einfache Brennkammergeometrie
  • verbesserter Wirkungsgrad
  • längere Lebensdauer der elektronischen Einrichtungen durch die Kühlung
  • Möglichkeit, ohne zusätzliche Gasleitungen auszukommen und dadurch höhere Sicherheit durch Verringerung von gasführenden Bauteilen.
The advantages of the present invention are:
  • high proportion of radiation energy
  • low emissions
  • quick and visually recognizable response to changes in burner output
  • large control range
  • Despite the high surface temperature (> 800 ° C) of the fiber burner plate, the burner chamber and the edge of the burner chamber remain relatively cool (approx. 50 ° C)
  • Uniform bright glow pattern due to the high emissivity (95%) of SiC
  • simple, compact and inexpensive construction with low heights (approx. 80 mm)
  • clear arrangement of all assemblies
  • easy to maintain and repair
  • a blower / fan
    for the forced ventilation of all burners
    for the various cooling tasks
  • The burner control unit is easily accessible at all times
  • interchangeable gas nozzles for different types of gas
  • simple combustion chamber geometry
  • improved efficiency
  • longer life of the electronic devices due to the cooling
  • Possibility of getting by without additional gas lines and thus greater security by reducing gas-carrying components.

Claims (10)

Gaskocheinrichtung mit wenigstens einem unter einer durchgehenden Kochfläche aus einem für Warmestrahlung durchlassigen Material, wie Glaskeramik, Glas, Keramik bzw. einem ähnlichen Material angeordneten Gasstrahlungsbrenner mit einer Brennerkammer und einer Brennerplatte, insbesondere aus Fasermaterial, mit Regeleinrichtungen für die Gaszufuhr, sowie mit üblichen Zünd-, Sicherheits- und Temperaturüberwachungseinrichtungen, mit Abgaskanälen zum Abführen der Verbrennungsgase, sowie mit einer Einrichtung, insbesondere einem Gebläse, mit dem zusätzliche Luft an die Brennerplatte herangeführt wird, wobei sich die Einrichtung, mit der von außen zusätzlich Luft angesaugt und an die Brennerplatte herangeführt wird, und die Regeleinrichtung für die Gaszufuhr in einem abgetrennten Raum befinden, in dem ein Überdruck aufrecht erhalten wird, und der über, im Bereich außerhalb des abgetrennten Raumes auf ihren Umfangsflächen gasdichte Leitungen, insbesondere über Rohre mit der Brennerkammer und nach außen in Verbindung steht,
dadurch gekennzeichnet,
daß die Regeleinrichtung für die Gaszufuhr einen Ventilblock, insbesondere mit magnetischer Steuerung, mit im Block positionierten auswechselbaren Düsen, mit Öffnungsdurchmessern von 0.5 mm bis 2.0 mm, insbesondere 1 mm, anpaßbar an verschiedene Gasarten enthält.Gas cooking device with at least one gas radiation burner arranged under a continuous cooking surface made of a material that is permeable to heat radiation, such as glass ceramic, glass, ceramic or a similar material, with a burner chamber and a burner plate, in particular made of fiber material, with control devices for the gas supply, and with conventional ignition devices. , Safety and temperature monitoring devices, with exhaust gas ducts for removing the combustion gases, and with a device, in particular a blower, with which additional air is brought to the burner plate, the device with which additional air is sucked in and brought to the burner plate , and the control device for the gas supply are located in a separate room, in which an overpressure is maintained, and via, in the area outside of the separated room on its peripheral surfaces, gas-tight lines, in particular via pipes with the Burner chamber and communicates with the outside,
characterized,
that the control device for the gas supply contains a valve block, in particular with magnetic control, with interchangeable nozzles positioned in the block, with opening diameters of 0.5 mm to 2.0 mm, in particular 1 mm, adaptable to different types of gas. Gaskocheinrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die gasdichten Leitungen verschiedene Eintrittsquerschnittsflächen aufweisen, rund, oval oder rechteckig ausgebildet, und mit Zügen oder Wendeln und/oder mit Verjüngungen und Einschnürungen im durchströmten Bereich versehen sind.Gas cooking device according to claim 1,
characterized,
that the gas-tight lines have different inlet cross-sectional areas, are round, oval or rectangular, and are provided with cables or coils and / or with tapering and constrictions in the area through which flow occurs. Gaskocheinrichtung nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet,
daß die Mitte der Eintrittsöffnung einer Leitung, die den abgetrennten Raum mit der Brennerkammer verbindet jeweils gegenüber einer Düsenöffnung, mit variabel dazu einstellbaren Abstand angeordnet ist.Gas cooking device according to claims 1 and 2,
characterized,
that the center of the inlet opening of a line, which connects the separated space with the burner chamber, is arranged opposite each nozzle opening, with a variably adjustable distance. Gaskocheinrichtung nach den Ansprüchen 1 bis 3,
dadurch gekennzeichnet,
daß die Leitung im Bereich des abgetrennten Raumes mit anpaßbaren, insbesonders radial angeordneten Durchbrechungen, als Eintrittsöffnungen für die Luft versehen ist, und insbesondere unmittelbar am Ventilblock oder in der Ebene der Düsenöffnung beginnt.Gas cooking device according to claims 1 to 3,
characterized,
that the line in the area of the separated space is provided with adaptable, in particular radially arranged openings, as inlet openings for the air, and in particular begins directly at the valve block or in the plane of the nozzle opening. Gaskocheinrichtung nach den Ansprüchen 1 bis 4,
dadurch gekennzeichnet,
daß die Leitungen über ihre gesamte Länge als Mischrohre für Luft und Gas dienen, wobei die Lufteinströmung in die Rohre durch den Überdruck und den in Folge der Gaseindüsung entstehenden Venturi-Effekt erreicht wird.Gas cooking device according to claims 1 to 4,
characterized,
that the lines serve as mixing tubes for air and gas over their entire length, the air inflow into the tubes being achieved by the excess pressure and the venturi effect which results from the gas injection. Gaskocheinrichtung nach den Ansprüchen 1 bis 5,
dadurch gekennzeichnet,
daß die Eintritts-Querschnittsfläche der Leitung für die Zufuhr des Gas-/Luftgemisches mindestens 150 mm² beträgt.Gas cooking device according to claims 1 to 5,
characterized,
that the inlet cross-sectional area of the line for the supply of the gas / air mixture is at least 150 mm². Gaskocheinrichtung nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet,
daß der Ventilblock als Teil der Regeleinrichtung für die Gaszufuhr in dem abgetrennten Raum so angeordnet ist, daß er mittels seiner im Ventilblock positionierten Düsen das Gas seitlich, in einem Winkel von kleiner 90° in Öffnungen, die in der Leitung vorgesehen sind einschießt.Gas cooking device according to claims 1 and 2,
characterized,
that the valve block is arranged as part of the control device for the gas supply in the separated space so that it shoots the gas laterally, by means of its nozzles positioned in the valve block, at an angle of less than 90 ° into openings provided in the line. Gaskocheinrichtung nach den Ansprüchen 1 bis 7,
dadurch gekennzeichnet,
daß das Gebläse zusätzlich über ein in den Außenwänden` der Kocheinrichtung installiertes Luftleitsystem die Gehäusewandung kühlt.Gas cooking device according to claims 1 to 7,
characterized,
that the fan also cools the housing wall via an air duct system installed in the outer walls of the cooking device. Gaskocheinrichtung nach den Ansprüchen 1 bis 8,
dadurch gekennzeichnet,
daß das durch die Leitungen an die Brennerplatte herangebrachte Gas-/Luftgemisch so geführt wird, daß es durch die heißen Abgase vorgewärmt wird.Gas cooking device according to claims 1 to 8,
characterized,
that the gas / air mixture brought through the lines to the burner plate is guided so that it is preheated by the hot exhaust gases. Gaskocheinrichtung nach den Ansprüchen 1 bis 9,
dadurch gekennzeichnet,
daß die Brennerplatte als Fasermaterial insbesondere SiC-Fasern enthält.Gas cooking device according to claims 1 to 9,
characterized,
that the burner plate contains in particular SiC fibers as fiber material.
EP94107892A 1993-08-11 1994-05-21 Gas cooking device with under a continuous cooking area of heat radiation transparent material, like glass-ceramics, placed radiant gas burners Expired - Lifetime EP0638771B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4326945A DE4326945C2 (en) 1993-08-11 1993-08-11 Control device for the gas supply to a gas cooking device with gas radiation burners arranged under a continuous cooking surface
DE4326945 1993-08-11

Publications (2)

Publication Number Publication Date
EP0638771A1 true EP0638771A1 (en) 1995-02-15
EP0638771B1 EP0638771B1 (en) 1997-07-02

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Country Link
US (1) US5509403A (en)
EP (1) EP0638771B1 (en)
JP (1) JP2717768B2 (en)
DE (2) DE4326945C2 (en)
ES (1) ES2104230T3 (en)

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DE4326945C2 (en) 1996-10-24
DE59403243D1 (en) 1997-08-07
DE4326945A1 (en) 1995-02-16
JPH0755151A (en) 1995-03-03
EP0638771B1 (en) 1997-07-02
US5509403A (en) 1996-04-23
JP2717768B2 (en) 1998-02-25

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